fix: keep birthdays and show Shamsi dates

Imported customers keep their birthday, and assistant text plus remaining calendars use the Jalali date.

Co-authored-by: Cursor <cursoragent@cursor.com>

apps/api/src/common/jalali.ts

@@ -103,6 +103,121 @@ export function jalaliMonthKey(d: Date): string {
   return `${jy}-${String(jm).padStart(2, '0')}`;
 }
 
+const FA_DIGITS = '۰۱۲۳۴۵۶۷۸۹';
+
+function toAsciiDigits(value: string) {
+  return value
+    .replace(/[۰-۹]/g, (d) => String(FA_DIGITS.indexOf(d)))
+    .replace(/[٠-٩]/g, (d) => String('٠١٢٣٤٥٦٧٨٩'.indexOf(d)));
+}
+
+function toFaDigits(value: string | number) {
+  return String(value).replace(/\d/g, (d) => FA_DIGITS[Number(d)] ?? d);
+}
+
+function tehranYmd(d: Date) {
+  const [gy, gm, gd] = new Intl.DateTimeFormat('en-CA', {
+    timeZone: 'Asia/Tehran',
+    year: 'numeric',
+    month: '2-digit',
+    day: '2-digit',
+  })
+    .format(d)
+    .split('-')
+    .map(Number);
+  return { gy, gm, gd };
+}
+
+/** تاریخ شمسی تهران، مثل ۱۴۰۲/۰۶/۱۲ */
+export function formatTehranJalali(d: Date): string {
+  const { gy, gm, gd } = tehranYmd(d);
+  const j = toJalali(gy, gm, gd);
+  return `${toFaDigits(j.jy)}/${toFaDigits(String(j.jm).padStart(2, '0'))}/${toFaDigits(String(j.jd).padStart(2, '0'))}`;
+}
+
+const GREG_MONTHS: Array<[string, number]> = [
+  ['ژانویه', 1],
+  ['january', 1],
+  ['فوریه', 2],
+  ['february', 2],
+  ['مارس', 3],
+  ['march', 3],
+  ['آوریل', 4],
+  ['april', 4],
+  ['ژوئن', 6],
+  ['june', 6],
+  ['ژوئیه', 7],
+  ['جولای', 7],
+  ['july', 7],
+  ['اوت', 8],
+  ['آگوست', 8],
+  ['آگست', 8],
+  ['august', 8],
+  ['سپتامبر', 9],
+  ['september', 9],
+  ['اکتبر', 10],
+  ['october', 10],
+  ['نوامبر', 11],
+  ['november', 11],
+  ['دسامبر', 12],
+  ['december', 12],
+  ['مه', 5],
+  ['می', 5],
+  ['may', 5],
+];
+
+function gregMonthNumber(name: string): number | null {
+  const key = name.trim().toLowerCase();
+  return GREG_MONTHS.find(([label]) => label === key)?.[1] ?? null;
+}
+
+function inferGregorianYear(month: number, day: number, now = new Date()): number {
+  const { gy, gm, gd } = tehranYmd(now);
+  if (month > gm || (month === gm && day > gd)) return gy - 1;
+  return gy;
+}
+
+function jalaliFromGregorian(year: number, month: number, day: number): string | null {
+  if (month < 1 || month > 12 || day < 1 || day > 31 || year < 1700 || year > 2500) return null;
+  const j = toJalali(year, month, day);
+  return `${toFaDigits(j.jy)}/${toFaDigits(String(j.jm).padStart(2, '0'))}/${toFaDigits(String(j.jd).padStart(2, '0'))}`;
+}
+
+/** «21 سپتامبر» و تاریخ میلادی عددی را در متن کاربر به شمسی تبدیل می‌کند. */
+export function rewriteGregorianDates(text: string, now = new Date()): string {
+  const monthAlt = GREG_MONTHS.map(([name]) => name).join('|');
+  const dayMonth = new RegExp(
+    `(^|[^\\p{L}\\d])([0-9۰-۹]{1,2})\\s*(${monthAlt})(?![\\p{L}\\u200c])(?:\\s+([0-9۰-۹]{4}))?`,
+    'giu',
+  );
+  const monthDay = new RegExp(
+    `(^|[^\\p{L}\\d])(${monthAlt})(?![\\p{L}\\u200c])\\s+([0-9۰-۹]{1,2})(?:\\s*,?\\s*([0-9۰-۹]{4}))?`,
+    'giu',
+  );
+  const iso = /\b((?:19|20)\d{2})-(\d{2})-(\d{2})\b/g;
+
+  const fromParts = (dayRaw: string, monthName: string, yearRaw?: string) => {
+    const day = Number(toAsciiDigits(dayRaw));
+    const month = gregMonthNumber(monthName);
+    if (!month) return null;
+    const year = yearRaw ? Number(toAsciiDigits(yearRaw)) : inferGregorianYear(month, day, now);
+    return jalaliFromGregorian(year, month, day);
+  };
+
+  let out = text.replace(dayMonth, (full, lead: string, day: string, month: string, year?: string) => {
+    const next = fromParts(day, month, year);
+    return next ? `${lead}${next}` : full;
+  });
+  out = out.replace(monthDay, (full, lead: string, month: string, day: string, year?: string) => {
+    const next = fromParts(day, month, year);
+    return next ? `${lead}${next}` : full;
+  });
+  out = out.replace(iso, (full, year: string, month: string, day: string) => {
+    return jalaliFromGregorian(Number(year), Number(month), Number(day)) ?? full;
+  });
+  return out;
+}
+
 export function startOfJalaliMonth(jy: number, jm: number): Date {
   return jalaliToDate(jy, jm, 1);
 }